Square D HDA36125UO 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36125UO 125A 3-Pole 600 V Circuit Breaker — a rugged, reliable protection device designed for three-phase distribution in industrial and commercial electrical systems. With a 125-amp rating and a 600-volt maximum, this rugged breaker safeguards wiring and equipment from overcurrent events while integrating smoothly into compatible Square D panels.

Key specifications

• Part Number: HDA36125UO
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Brand: Square D (Schneider Electric)

Why this matters

• A three-pole design provides balanced protection for 3-phase loads, helping maintain motor performance and system stability.
• The 125 A capacity makes it suitable for feeder protection and branch circuits in mid-size commercial installations or light industrial setups.
• A 600 V rating expands protection across higher voltage distribution networks common in industrial plants, adding versatility for various equipment and lines.
• Built with Square D’s proven reliability, this breaker delivers consistent trip behavior and durable performance in demanding environments.

Ideal use scenarios

• Protect three-phase motors, conveyors, pumps, and HVAC equipment in manufacturing facilities.
• Distribution feeder protection for panels serving 3-phase machinery operating up to 600 V.
• Replacement or retrofit in compatible Square D panelboards to maintain standardization and ease of maintenance.

Installation and compatibility tips

Use this breaker in panels and enclosures that are compatible with Square D devices and within the 600 V maximum specification. Confirm that your panel listing supports HDA-series devices and that the configuration matches your system requirements. When wiring, follow local codes and manufacturer torque recommendations to ensure a secure, reliable connection.